It is the rarest of them all: a Philip Johnson masterpiece, never to be repeated. Built in 1964, with an exquisite and sensitive update completed in 2008, the light-filled house boasts elegant living spaces, a stunning double staircase, a unique dining room with an arched canopy, five luxurious bedrooms and eight baths. The nearly 7 parklike acres include a media house, modernist cabana, pool and tennis court. This award-winner has been featured in books, magazines and The New York Times.